| 摘要 |
PURPOSE:To obtain a rapid hardening admixture of cement improving workability and developing excellent initial strength, comprising a mixture of an inorganic sulfate, a specific ratio of fluorohauynite and calcium aluminate as a main component. CONSTITUTION:100pts.wt. mixture of 30-90wt.% fluorohauynite and 70-10wt.% calcium aluminate and 50-300pts.wt. inorganic sulfate are used as main components to constitute a rapid hardening admixture of cement. Anhydrous gypsum of II type, etc., are used a the inorganic sulfate. About 10-40pts.wt. of the rapid hardening admixture of cement is used based on 100pts.wt. cement. By using this rapid hardening admixture, initial strength development is obtained even by making setting time >=1 hour. Since operation time can be prolonged, a large amount of slip can be placed. |
